Meaning of せいなんにほん in Japanese

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Definition of せいなんにほん

せいなんにほん(seinannihon) 【西南日本】

(n) southwest Japan (southwest of the Itoigawa-Shizuoka Tectonic Line) →Related words: 東北日本

せいなんにほんないたい(seinannihonnaitai) 【西南日本内帯】

(n) area of southwestern Japan north of the Median Tectonic Line →Related words: 西南日本

せいなんにほんがいたい(seinannihongaitai) 【西南日本外帯】

(n) area of southwestern Japan south of the Median Tectonic Line →Related words: 西南日本